um

From Wiktionary

Interjection[change]

Interjection
um

  1. You use um to show that you are thinking and not ready to speak.
    We were prepared, um, in our minds, in our heart, for -- for whatever.
    What she did isn't so, um, nice.
  2. You use um to show that you doubt or are not sure about something somebody said.
    Um, I don't think that works.
    What? Um, okay. Sure, I guess. I'll tell her.
  3. You use um with a falling tone to show that you agree.
    "How does Tuesday sound?" "Um, sure. Sounds good!"
  4. You use um to get somebody's attention.
    Um, excuse me! Are you busy?
  5. You use um to bring attention to something that just happened or that was just said.
    Um, did you just call me "stupid"?